(19)
(11) EP 2 843 831 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.01.2016 Bulletin 2016/03

(43) Date of publication A2:
04.03.2015 Bulletin 2015/10

(21) Application number: 14183133.9

(22) Date of filing: 02.09.2014
(51) International Patent Classification (IPC): 
H02P 29/02(2006.01)
 H02P 7/29(2016.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 03.09.2013 JP 2013182325

(71) Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
Niwa-gun, Aichi 480-0195 (JP)

(72) Inventor:
  • Fujii, Masanori
    Niwa-gun, Aichi 480-0195 (JP)

(74) Representative: Betten & Resch 
Patent- und Rechtsanwälte PartGmbB Maximiliansplatz 14
80333 München
80333 München (DE)

   


(54) Motor drive unit


(57) A motor drive unit includes a motor drive circuit that drives a motor by controlling on/off of current, a control unit generating a drive command signal for driving the motor, a current feedback circuit with the motor and outputs a comparison output signal based on comparison between a current detection signal of a motor current and a target value signal, a latch circuit that latches a current detection result based on the drive command signal and the comparison output signal, and a gate circuit for driving the motor drive circuit based on the drive command signal and a latch output signal output from the latch circuit. The control unit detects a failure of a current feedback system including the current feedback circuit and the latch circuit according to a state of the latch output signal inputted after a time measured based on the drive command signal reaches a predetermined time.







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